STANDARD Chemistry Rate Laws and Dimensions Match the Following Question
Match the rate law given in column-I with the dimensions of rate constants given in column-II and mark the appropriate choice.
Column-I (A) Rate = k[NH₃]⁰ (B) Rate = k[H₂O₂][I⁻] (C) Rate = k[CH₃CHO]³/₂ (D) Rate = k[C₂H₅Cl]
Column-II (i) Mol L⁻¹ s⁻¹ (ii) L mol⁻¹ s⁻¹ (iii) s⁻¹ (iv) L¹/² mol⁻¹/² s⁻¹
(A) → (iv), (B) → (iii), (C) → (ii), (D) → (i)
(A) → (i), (B) → (ii), (C) → (iii), (D) → (iv)
(A) → (ii), (B) → (i), (C) → (iv), (D) → (iii)
(A) → (i), (B) → (iii), (C) → (iv), (D) → (ii)
Correct Answer
Detailed Explanation
The dimensions of the rate constant depend on the overall order of the reaction. For zero-order reactions, the unit is mol L⁻¹ s⁻¹, for first-order it is s⁻¹, for second-order it is L mol⁻¹ s⁻¹, and for fractional orders, it varies accordingly.
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